Maximus, as Caesar. 235-238 AD. AR Denarius (2.85 gm). Struck 236-238 AD. 

MAXIMVS CAES GERM, bare-headed, draped bust right.
PRINC IVVENTVTIS, Maximus standing left, holding baton and transverse spear; two standards on right. 

RIC IV 3; BMCRE 211; RSC 10.

With permission of CNG Auction 32 (as historicalcoins.com), lot 63313